No they wont,I got the Hydra poles,the aluminium ones and got a G fit gooseneck from gardeners and it does'nt fit,I'm gonna slap it on Ebay!
Their brushes will fit on the normal plastic angle adapter but their goosenecks wont as their thread in the goosenecks are to far back within the gooseneck and on the Hydra poles their is metal behind the thread for a spanner to fit preventing the G fit gooseneck to fit.
Hope you know what I mean.